Poorly consolidated formation roadway support method and system

Abstract

The invention relates to a poorly consolidated formation roadway support method and system. The poorly consolidated formation roadway support method and system are suitable for poorly consolidated formation rock in west mining areas, wherein the poorly consolidated formation rock has the disadvantages that strength is low, the consolidation performance is poor and the poorly consolidated formation rock is disintegrated when encountering water; due to the influences of excavation disturbance, the shallow part surrounding rock of a roadway is wide in destruction range within a short period of time, and the phase change phenomenon from rock to gravel particles happens during destruction; stability can hardly be effectively controlled through traditional anchor net support and bolting and grouting reinforcement. The poorly consolidated formation roadway support method includes the steps of firstly, prefabricating a hollow shell, arranging the shell on the surface of the excavated roadway through bolt supporting, and exerting certain pre-tightening force on surrounding rock through anchor rods; secondly, injecting expansibility grout in a filling bag of the hollow shell, exerting pre-tightening force on the surrounding rock through the grout in the solidification process due to the expansion effect, and limiting deformation of the surrounding rock; thirdly, implementing full-fracture-surface grouting and bottom plate concrete pouring. The method is easy to operate and convenient to construct, and is mainly applied to poorly consolidated formation roadway support projects.

Description

technical field [0001] The invention relates to a roadway support method in coal mines, and is especially suitable for a roadway support method and a support system in weakly cemented stratum roadway support projects in western and northwest mining areas of my country. Background technique [0002] Minable coal seams in the western and northwestern mining areas of my country occur in the Jurassic and Cretaceous strata. Due to the influence of the diagenetic environment, this type of rock has the characteristics of low strength, poor cementation, and water disintegration. Surrounding rocks have large deformations and large damage ranges. The traditional anchor-mesh support and anchor-grouting reinforcement methods cannot effectively control the stability of the roadway. Contents of the invention [0003] In order to solve the above problems, the present invention provides a roadway active control method suitable for weakly cemented strata and large deformation, which can eff...

AI Technical Summary

Problems solved by technology

[0002] Minable coal seams in the western and northwestern mining areas of my country occur in the Jurassic and Cretaceous strata. Due to the influence of the diagenetic environment, this type of rock has the characteristics of low strength, poor cementation, and water disintegration. Surrounding rocks have large deformations and large damage ranges. The traditional anchor-mesh support and anchor-grouting reinforcement methods cannot effectively control the stability of the roadway. The repair rate of the roadway is high, and the cost of support has increased significantly, which restricts the safe production of mines in the west and northwest.

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